An alternative to plain old telephone service (POTS) would be:（）
- A、X.25.
- B、Asynchronous transfer mode (ATM).
- C、VoIP.
- D、Public Switched Telephone Network (PSTN).
正确答案:C
答案解析:有
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CompTIA认证考试
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An alternative to plain old telephone service (POTS) would be:（）
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